Wireless Terminal Low-Power Wake-Up for DRX Latency Balance
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Solution Overview
Problem
5G devices face significant power consumption challenges, especially in idle/inactive states, and existing Discontinuous Reception (eDRX) cycles fail to meet both battery life and low latency requirements for latency-critical use cases, necessitating a more efficient power management approach.
Innovation Solution
Implementing a low power signal, such as a Low Power Wake-Up Signal (LP-WUS) or Low Power Synchronization Signal (LP-SS), to trigger measurements in wireless communication terminals, allowing for relaxed Radio Link Monitoring (RLM), Beam Failure Detection (BFD), and Radio Resource Management (RRM) measurements, reducing power consumption by minimizing the need for full radio activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If extended Discontinuous Reception (eDRX) cycles with large values are used to meet battery life requirements, then power consumption is reduced and battery life is extended, but latency increases which is not suitable for services with low latency requirements
Solution Approach 1:
The patent implements Discontinuous Reception (DRX) cycles where the UE periodically wakes up to monitor paging messages and then returns to sleep mode. This periodic action allows the device to extend battery life by minimizing active reception time while still maintaining the ability to receive incoming communications at scheduled intervals, thus resolving the contradiction between extended battery life and acceptable latency through structured periodic monitoring.
Solution Approach 2:
The patent introduces adjustable DRX cycle lengths that can be dynamically configured based on service requirements. For latency-critical services, shorter DRX cycles are used to reduce latency, while for non-critical services, longer cycles extend battery life. This dynamic adaptability allows the system to optimize the trade-off between battery life and latency according to specific service needs.
2Reliability
If UEs wake up periodically once per DRX cycle to monitor for signaling or data traffic, then they can receive communications, but power consumption is dominated by these periodic wake-ups during periods with no traffic
Solution Approach 1:
The patent extracts the essential function of monitoring incoming communications from the full radio activation process. By using a simplified wake-up mechanism that only checks for the presence of paging messages or data indications rather than fully activating the radio for complete signal processing, the system maintains communication reception reliability while dramatically reducing power consumption during periodic wake-ups.
Solution Approach 2:
The patent applies partial action by implementing a reduced-functionality wake-up mode where the UE performs only minimal monitoring tasks during DRX cycle wake-ups. Instead of fully activating all radio functions, the device performs just enough action to detect incoming communications, then returns to sleep. This partial activation significantly reduces power consumption while maintaining the ability to receive communications when needed.
Data Source
AI summary
A wireless communication method is disclosed. The method comprises performing, by a wireless communication terminal, a measurement in a serving cell based on a low power signal, received from a wireless communication node in response to a starting condition of the measurement in the serving cell being satisfied.